3. the highest level or degree attainable; the highest stage of development

his landscapes were deemed the acme of beauty|the artist's gifts are at their acme|at the height of her career|the peak of perfection|summer was at its peak|...catapulted Einstein to the pinnacle of fame|the summit of his ambition|so many highest superlatives achieved by man|at the top of his profession

source: wordnet30

4. the top or extreme point of something (usually a mountain or hill)

the view from the peak was magnificent|they clambered to the tip of Monadnock|the region is a few molecules wide at the summit

source: wordnet30

5. a V shape

the cannibal's teeth were filed to sharp points

source: wordnet30

6. the highest point (of something)

at the peak of the pyramid

source: wordnet30

7. a brim that projects to the front to shade the eyes

he pulled down the bill of his cap and trudged ahead

source: wordnet30

8. A point; the sharp end or top of anything that terminates in a point; as, the peak, or front, of a cap.

source: webster1913

verb

9. to reach the highest point; attain maximum intensity, activity

That wild, speculative spirit peaked in 1929|Bids for the painting topped out at $50 million

source: wordnet30

10. To rise or extend into a peak or point; to form, or appear as, a peak.

source: webster1913

11. To raise to a position perpendicular, or more nearly so; as, to peak oars, to hold them upright; to peak a gaff or yard, to set it nearer the perpendicular.